WO2015063705A1 - Electromagnetic transducer for generating vibrations for sound and/or words bone conduction - Google Patents

Electromagnetic transducer for generating vibrations for sound and/or words bone conduction Download PDF

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Publication number
WO2015063705A1
WO2015063705A1 PCT/IB2014/065695 IB2014065695W WO2015063705A1 WO 2015063705 A1 WO2015063705 A1 WO 2015063705A1 IB 2014065695 W IB2014065695 W IB 2014065695W WO 2015063705 A1 WO2015063705 A1 WO 2015063705A1
Authority
WO
WIPO (PCT)
Prior art keywords
electromagnetic transducer
base plate
vibrating diaphragm
ferromagnetic material
material base
Prior art date
Application number
PCT/IB2014/065695
Other languages
French (fr)
Inventor
Paolo Collini
Marco COLLINI
Original Assignee
Tmpgest Di Fedeli Danila & C. S.A.S.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tmpgest Di Fedeli Danila & C. S.A.S. filed Critical Tmpgest Di Fedeli Danila & C. S.A.S.
Priority to US15/032,476 priority Critical patent/US20160261956A1/en
Priority to CN201480070221.4A priority patent/CN105850153B/en
Priority to EP14812606.3A priority patent/EP3063953A1/en
Publication of WO2015063705A1 publication Critical patent/WO2015063705A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
    • H04R25/604—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers
    • H04R25/606—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers acting directly on the eardrum, the ossicles or the skull, e.g. mastoid, tooth, maxillary or mandibular bone, or mechanically stimulating the cochlea, e.g. at the oval window
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C11/00—Non-optical adjuncts; Attachment thereof
    • G02C11/10—Electronic devices other than hearing aids
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/028—Casings; Cabinets ; Supports therefor; Mountings therein associated with devices performing functions other than acoustics, e.g. electric candles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
    • H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/027—Electrical or mechanical reduction of yoke vibration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/027—Diaphragms comprising metallic materials
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/13—Hearing devices using bone conduction transducers

Definitions

  • Electromagnetic transducer for generating vibrations for sounds and/or words bone conduction
  • the present invention refers to an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction in accordance with the preamble of claim 1.
  • transducers of the type specified above are becoming increasingly more popular than conventional types of earphones. This depends on the fact that bone conduction technology allows a user to be able to listen to music, sounds and words without necessarily having to insert earphones inside the ears or having to wear annoying headphones .
  • US 4628907 discloses a direct contact hearing aid apparatus adapted to be mounted deep within the ear canal, said apparatus including an output electromechanical transducer for converting audio output signals into mechanical movement of an output coupling element without the production of discernible sound waves to prevent acoustic feedback.
  • WO 2012/045852 discloses a hearing aid system incorporating an electromagnetic actuator comprising one or more permanent magnets.
  • the problem forming the basis of the present invention is that of devising an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction having structural and functional characteristics such as to satisfy the aforementioned requirement, while at the same time avoiding the drawbacks that were mentioned with reference to the prior art.
  • such a problem is moreover solved with an object according to claim 14, as well as with an eyeglass frame in accordance with claim 15, comprising a housing in which an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction according to the invention is received.
  • figure 1 represents a perspective view of an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction according to the present invention
  • figure 2 represents a perspective view of the electromagnetic transducer of figure 1 according to a different angle
  • FIGS 3, 4 and 5 represent views of the electromagnetic transducer of figure 1, from the top, side and from below, respectively;
  • figure 6 represents a longitudinal section plan view according to the section line VI-VI of figure 3;
  • figure 7a represents a simplified perspective view of the outer side of a frame front for eyeglass in the temple of which the electromagnetic transducer for generating vibrations for sounds and/or words bone conduction of figure 1 is housed;
  • figure 7b represents a perspective view from the inner side of the frame front of figure 7a;
  • figure 7c represents a detail of figure 7b according to a different point of view
  • FIG. 8 represents a perspective view of a single temple of the eyeglass frame of figure 1;
  • FIG. 9 represents an enlarged view of the temple for an eyeglass frame of figure 8.
  • figure 10 represents a partially sectioned side view of the detail of figure 9;
  • figure 11 represents an exploded view of the detail of figure 9;
  • FIG. 12 represents an enlargement of a detail of the temple of the eyeglass frame of figure 7 according to a variant embodiment
  • reference numeral 1 wholly indicates an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction according to the invention .
  • the electromagnetic transducer 1 comprises a magnetic yoke comprising:
  • the base plate 2 of ferromagnetic material has a rectangular shape ;
  • a magnetic pole 3 protruding axially from a central area of the base plate 2 of ferromagnetic material, said magnetic pole 3 having an elongated shape in the aforementioned first direction X-X perpendicular to the axis of said magnetic pole 3;
  • voice coil 4 positioned around the magnetic pole 3, said voice coil 4 having an elongated shape in the aforementioned first direction X-X with reference to the elongated shape of the magnetic pole 3 around which it is positioned;
  • each permanent magnet 5 of the aforementioned pair of permanent magnets being positioned near to a respective short side 2a of the base plate 2 of ferromagnetic material, so that the voice coil 4 is positioned and comprised between the aforementioned pair of permanent magnets 5 along the aforementioned first direction X-X;
  • the aforementioned fixing means comprise non- ferromagnetic support means 7 for interrupting the direct magnetic continuity of the vibrating diaphragm 6 with said base plate 2 of ferromagnetic material.
  • the aforementioned vibrating diaphragm 6 is spaced by a suitable air gap from the aforementioned magnetic pole 3, from the voice coil 4 as well as from the aforementioned pair of magnets.
  • the aforementioned non- ferromagnetic support means 7 extend along the aforementioned first direction X-X so as to exceed the aforementioned short sides 2a of the base plate 2 of ferromagnetic material with respective end portions 7a.
  • the aforementioned fixing means comprise a respective fastening bracket 8 that connects one short side 2a of the base plate 2 of ferromagnetic material with the respective end portion 7a exceeding said short side 2a, thus ensuring with this the support of the vibrating diaphragm 6 to the base plate 2 of ferromagnetic material according to the aforementioned parallel position, facing and spaced away from the base plate 2 of ferromagnetic material.
  • each fastening bracket 8 comprises a central core 8a which extends between opposite longitudinal ends from each of which a respective end wing 8b, 8c projects, inclined with respect to the straight line joining the aforementioned opposite ends of the central portion;
  • each fastening bracket 8 are inclined in an opposite manner from one another with respect to the straight line joining said opposite ends of the central core 8a and
  • each fastening bracket 8 being fixed to a short side 2a of said base plate 2 of ferromagnetic material
  • the second wing 8c of each fastening bracket 8 being fixed to the end portion 7a of said non- ferromagnetic support means 7, that is to say to one of the two portions of the non-ferromagnetic support means 7 which exceed the short sides 2a of the base plate 2 of ferromagnetic material.
  • each fastening bracket 8 defines a flat portion coupled with a corresponding and matching end portion 7a of said non- ferromagnetic support means 7.
  • each fastening bracket 8 comprises a flat central core 8a from the ends of which the aforementioned end wings 8b, 8c project at a right angle with respect to the central core 8a with inclinations that are opposite one another .
  • the aforementioned non-ferromagnetic support means 7 define a support frame, which:
  • the vibrating diaphragm 6 and the aforementioned support frame 7 are fixed to one another in correspondence of two opposite median portions defined with reference to the first direction X-X, the opposite portions of the vibrating diaphragm 6 that are distal with respect to said median portions overhanging said median portions.
  • the vibrating diaphragm 6 substantially has a straight cross shape, in which from a rectangular core 6a arranged with the long sides 2b parallel with respect to said first direction X-X project two due opposite side portions 6b for fixing to the aforementioned support frame.
  • the central opening defined by said support frame extends in said first direction X-X so as to exceed the aforementioned distal portions of the vibrating diaphragm 6.
  • the bulk in plan of the vibrating diaphragm 6 is circumscribed in the bulk in plan of the base plate 2 of ferromagnetic material.
  • this is intended to be fixed and housed in a special housing seat 13 of an object 12.
  • the aforementioned object 12 is made up, as a non-limiting example, of a temple of an eyeglass frame.
  • the aforementioned eyeglass frame comprises a frame front 18, provided with nose pads 20, from which two respective and opposite temples 12 project.
  • the magnetic yoke of the electromagnetic transducer 1 is supported and kept in position inside the aforementioned housing seat 13 of the temple 12 by means of a resilient material element 9, in such a way that the electromagnetic transducer 1 is supported with elastic suspension by said resilient material element 9.
  • the transducer comprises a plate 10 for transmitting vibrations which is integrally and rigidly coupled with the vibrating diaphragm 6 through engaging means 11, which specifically comprise fixing screws 11 which engage corresponding holes foreseen both on the vibrating diaphragm 6 and in the aforementioned plate 10.
  • engaging means 11 which specifically comprise fixing screws 11 which engage corresponding holes foreseen both on the vibrating diaphragm 6 and in the aforementioned plate 10.
  • the vibrating diaphragm 6 and the plate 10 are integrally and rigidly coupled to one another by the aforementioned fixing screws 11 with the interposition, between them, of the portion of the aforementioned resilient material element 9 that secures said support with elastic suspension of the electromagnetic transducer to the aforementioned resilient material element 9.
  • the resilient material element 9 is highlighted comprising a perimetral edge 9a that delimits a substantially flat wall 9b, said substantially flat wall 9b being the aforementioned portion of the resilient material element 9 which is interposed between the vibrating diaphragm 6 and the plate 10 so as to secure the aforementioned support with the elastic suspension of the electromagnetic transducer 1 with respect to the temple 12.
  • the aforementioned perimetral edge 9a of the resilient material element 9 is engagingly shape coupled between matching profiles with a corresponding perimetral edge 14 that delimits the opening for accessing the housing seat 13 thus ensuring that the resilient material element 9 is fixed to the temple 12 and therefore the support with elastic suspension of the electromagnetic transducer 1 inside the housing seat 13, avoiding any direct contact (this without the interposition of a resilient material that is capable of softening the vibration) between the magnetic yoke of the electromagnetic transducer 1 and the walls of the temple 12 of the eyeglass frame.
  • the resilient material element 9 defines a hollow containment body inside which the electromagnetic transducer 1 is inserted and kept.
  • the resilient material element 9 comprises a perimetral edge 9a that delimits a substantially flat front wall 9b, to which the plate 10 is directly applied for transmitting vibrations coming from the vibrating diaphragm 6 of the electromagnetic transducer 1.
  • the plate 10 can be glued to the wall 9b of the resilient material element 9 or, more preferably, the aforementioned wall 9b can comprise a through opening that is delimited by a perimetral edge with which the perimetral edge of the plate 10 is engaged, with shape coupling between matching profiles.
  • this makes it possible to avoid, or at least strongly reduce, that the vibrations of the electromagnetic transducer 1 propagate also to the object 12.
  • the aforementioned object 12 comprises a microphone that is associated with its structure, and the user of the object 12 is having an audio conversation, for example a telephone conversation, with an interlocutor
  • the absence of vibrations transmitted by the electromagnetic transducer to the object 12 itself makes it possible to prevent such vibrations from being picked up by the aforementioned microphone that is mounted at the edge of the object 12 itself generating an annoying echo return that is perceived by the aforementioned interlocutor.
  • a lid 15 which is associated with the side of the respective plate 10 that is opposite the side of such a plate 10 facing the vibrating diaphragm 6 of the electromagnetic transducer 1.
  • a lid 15 carries out the double function of hiding the plate 10 (and the fixing means 11 in the case of the embodiment of figures 9 to 11) as well as of ensuring the transmission of the vibrations from the vibrating diaphragm 6 of the electromagnetic transducer 1 to the portion of the body of the user which is in contact with such a lid 15, in the example a user wearing the eye glass comprising the temples 12 in the housing seats 13 of which the electromagnetic transducers 1 are housed.
  • the aforementioned microphone 16 is preferably housed, in a position that is protected, inside a cavity of the frame front 18.
  • the frame front 18 is provided with at least one through hole 19 (in the example of figures 7b and 7c there are two through holes 19) for connecting the inside of the aforementioned cavity present inside the frame front 18 with the outside of the frame front.
  • the aforementioned microphone 16 is housed in a cavity obtained in correspondence of the central portion of the frame front 18, more specifically in the portion comprised between the two nose pads 20, preferably above such nose pads.
  • a frame for eyeglass in which the aforementioned microphone is positioned in correspondence of one of the two side portions of the frame front, that is to say near to a portion where the frame front 18 is connected, in an articulated manner, to a respective temple.
  • the frame front 18 of the eyeglass frame it is worth highlighting how in it an inner side (cf. fig. 7b) facing towards the face of the user, wearing the eyeglass frame and an opposite outer side (cf. fig. 7a) can be defined.
  • the aforementioned hole 19 through which the sounds and/or the voices reach from outside to the microphone 16, it is advantageously positioned in correspondence of the aforementioned inner side of the frame front .
  • the microphone 16 makes it possible for the microphone 16 to pick up the sounds and/or the words emitted from the mouth of the user wearing the eyeglass frame in a correct and efficient manner, without being disturbed by elements such as wind that hits the eyeglass frame.
  • each through hole 19 extends from the aforementioned inner cavity of the frame front 18 so as to emerge outside the frame front 18 in correspondence of a point of such a frame front 18 positioned in the groove, or against it, in which the lenses (not illustrated) are inserted and held. More in detail, the through hole 19 emerges out from the frame front 18 at a point that is further back than the respective lens with respect to the outer side of the frame front. After the tests carried out, such a positioning of the through holes 19 was found to be preferred since the lens makes it possible to obtain an effective wind barrier, preventing the microphone from detecting crackles and the like, despite being very close to the mouth of the user wearing the eyeglass frame.
  • the through hole in communication with the aforementioned cavity is advantageous for the through hole in communication with the aforementioned cavity to emerge near to or inside the groove in which the lenses are inserted, in a position that is further back than the lens with respect to the outer side of the frame front.
  • the electromagnetic transducer for generating vibrations for sounds and/or words bone conduction makes it possible to satisfy the aforementioned requirement and to overcome at the same time the drawbacks referred to in the introductory part of the present description with reference to the prior art.
  • the structure of the electromagnetic transducer for generating vibrations for sounds and/or words bone conduction despite having small dimensions and bulk makes it possible to ensure an excellent transduction of the sounds and/or words perceived by the user.
  • the aforementioned characteristic of the electromagnetic transducer of being supported with elastic suspension makes it possible to avoid, or in any case to reduce, that the vibrations generated by the electromechanical transducer are directly transmitted, i.e. interposition of one layer of resilient and softening material, to the object in which said transducer is housed.

Abstract

An electromagnetic transducer for generating vibrations for sounds and/or words bone conduction, comprising a magnetic yoke comprising a ferromagnetic material base plate (2), a magnetic pole (3), a voice coil (4) positioned around the magnetic pole (3), a pair of permanent magnets (5) positioned outside said voice coil (4) and a vibrating diaphragm (6) of ferromagnetic material supported by said non-ferromagnetic support means (7). Advantageously, such support means (7) are supported by said base plate (2) by means of fastening brackets (8) that engage portions of said support means (7) projecting beyond said base plate (2), exceeding opposite ends of the base plate (2).

Description

"Electromagnetic transducer for generating vibrations for sounds and/or words bone conduction"
DESCRIPTION
The present invention refers to an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction in accordance with the preamble of claim 1.
Nowadays, transducers of the type specified above are becoming increasingly more popular than conventional types of earphones. This depends on the fact that bone conduction technology allows a user to be able to listen to music, sounds and words without necessarily having to insert earphones inside the ears or having to wear annoying headphones .
Indeed, in the case of an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction, it is sufficient for such a transducer to come into contact with a portion of the head in which bones are not particularly protected from soft parts like muscles or fat, so that the user can listen to sounds and/or words in a clear manner and irrespective of the external noise that can be perceived with the hearing apparatus.
For instance US 4628907 discloses a direct contact hearing aid apparatus adapted to be mounted deep within the ear canal, said apparatus including an output electromechanical transducer for converting audio output signals into mechanical movement of an output coupling element without the production of discernible sound waves to prevent acoustic feedback.
Furthermore WO 2012/045852 discloses a hearing aid system incorporating an electromagnetic actuator comprising one or more permanent magnets.
In the case of motorcyclists or skiers, a further possibility is that of applying the electromagnetic transducer to the body of the helmet worn by the user so as to ensure a correct listening of sounds and/or words by the user .
On the other hand, the use of magnetic transducers for sounds and/or words bone conduction has a drawback in terms of the audio quality with which the user is able to clearly and authentically perceive the sounds and/or the words. In order to ensure clear and authentic audio quality the specific shape that is used for the electromagnetic transducer is an essential element. Unfortunately, as it has been possible to observe, the best results can be achieved but only with magnetic transducers for sounds and/or words bone conduction having dimensions and bulk that are rather large .
Concerning the use of electromagnetic transducer for generating vibrations for sounds and/or words bone conduction having dimensions that are not suitably miniaturised or small does not create too many problems if combined with a helmet, it is clear however how this is not the case for other types of uses.
For example, in the case of an eyeglass frame the arrangement of an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction is quite problematic, especially in the case in which the dimensions of the aforementioned transducer are not very small, when trying to house it in the temples of the eye glass without affecting the appearance of the eyeglass itself negatively.
In respect to what has been outlined above, it is clear how there is the strong desire to make an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction which has excellent performance in terms of quality and authenticity of the sounds or of the words to be reproduced, has small bulk and dimensions, so as to allow it to be housed also in objects having small dimensions, for example temples of an eyeglass frame.
The problem forming the basis of the present invention is that of devising an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction having structural and functional characteristics such as to satisfy the aforementioned requirement, while at the same time avoiding the drawbacks that were mentioned with reference to the prior art.
Such a drawback is solved with an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction in accordance with the characteristics of claim 1.
According to one further aspect, such a problem is moreover solved with an object according to claim 14, as well as with an eyeglass frame in accordance with claim 15, comprising a housing in which an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction according to the invention is received.
Further characteristics and advantages of the electromagnetic transducer for generating vibrations for sounds and/or words bone conduction according to the present invention, shall become clearer from the following description of some of its preferred embodiments, given as an indication and not for limiting purposes, with reference to the attached figures, in which:
figure 1 represents a perspective view of an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction according to the present invention;
figure 2 represents a perspective view of the electromagnetic transducer of figure 1 according to a different angle;
figures 3, 4 and 5 represent views of the electromagnetic transducer of figure 1, from the top, side and from below, respectively;
- figure 6 represents a longitudinal section plan view according to the section line VI-VI of figure 3;
- figure 7a represents a simplified perspective view of the outer side of a frame front for eyeglass in the temple of which the electromagnetic transducer for generating vibrations for sounds and/or words bone conduction of figure 1 is housed;
- figure 7b represents a perspective view from the inner side of the frame front of figure 7a;
- figure 7c represents a detail of figure 7b according to a different point of view;
- figure 8 represents a perspective view of a single temple of the eyeglass frame of figure 1;
- figure 9 represents an enlarged view of the temple for an eyeglass frame of figure 8;
- figure 10 represents a partially sectioned side view of the detail of figure 9;
- figure 11 represents an exploded view of the detail of figure 9;
- figure 12 represents an enlargement of a detail of the temple of the eyeglass frame of figure 7 according to a variant embodiment;
- figure 13 represents a partially sectioned side view of the detail of figure 12; - figure 14 represents an exploded view of the detail of figure 12.
With reference to the attached figures, in particular to figures 1 to 6, reference numeral 1 wholly indicates an electromagnetic transducer for generating vibrations for sounds and/or words bone conduction according to the invention .
The electromagnetic transducer 1 comprises a magnetic yoke comprising:
- a base plate 2 of ferromagnetic material having an elongated shape in a first direction X-X, so that in the aforementioned base plate 2 two long sides 2b and two short sides 2a can be identified substantially extending parallel and, respectively, perpendicular with respect to said first direction X-X; according to the illustrated embodiment, the base plate 2 of ferromagnetic material has a rectangular shape ;
- a magnetic pole 3 protruding axially from a central area of the base plate 2 of ferromagnetic material, said magnetic pole 3 having an elongated shape in the aforementioned first direction X-X perpendicular to the axis of said magnetic pole 3;
- a voice coil 4 positioned around the magnetic pole 3, said voice coil 4 having an elongated shape in the aforementioned first direction X-X with reference to the elongated shape of the magnetic pole 3 around which it is positioned;
- a pair of permanent magnets 5 that are positioned outside the voice coil 4, each permanent magnet 5 of the aforementioned pair of permanent magnets being positioned near to a respective short side 2a of the base plate 2 of ferromagnetic material, so that the voice coil 4 is positioned and comprised between the aforementioned pair of permanent magnets 5 along the aforementioned first direction X-X;
- a vibrating diaphragm 6 of ferromagnetic material and fixing means for supporting and separating the aforementioned vibrating diaphragm 6 from the base plate 2 of ferromagnetic material, so that the vibrating diaphragm 6 is substantially parallel and faces the base plate 2 of ferromagnetic material and the voice coil 4 and the permanent magnets 5 are comprised between the base plate 2 of ferromagnetic material and the vibrating diaphragm 6.
The aforementioned fixing means comprise non- ferromagnetic support means 7 for interrupting the direct magnetic continuity of the vibrating diaphragm 6 with said base plate 2 of ferromagnetic material.
It is worth highlighting that the aforementioned vibrating diaphragm 6 is spaced by a suitable air gap from the aforementioned magnetic pole 3, from the voice coil 4 as well as from the aforementioned pair of magnets.
According to the invention the aforementioned non- ferromagnetic support means 7 extend along the aforementioned first direction X-X so as to exceed the aforementioned short sides 2a of the base plate 2 of ferromagnetic material with respective end portions 7a.
For each of the two aforementioned short sides 2a of the base plate 2 of ferromagnetic material the aforementioned fixing means comprise a respective fastening bracket 8 that connects one short side 2a of the base plate 2 of ferromagnetic material with the respective end portion 7a exceeding said short side 2a, thus ensuring with this the support of the vibrating diaphragm 6 to the base plate 2 of ferromagnetic material according to the aforementioned parallel position, facing and spaced away from the base plate 2 of ferromagnetic material.
It is worth highlighting that in accordance with the preferred embodiment illustrated in the figures:
- each fastening bracket 8 comprises a central core 8a which extends between opposite longitudinal ends from each of which a respective end wing 8b, 8c projects, inclined with respect to the straight line joining the aforementioned opposite ends of the central portion;
the end wings of each fastening bracket 8 are inclined in an opposite manner from one another with respect to the straight line joining said opposite ends of the central core 8a and
- a first wing 8b of each fastening bracket 8 being fixed to a short side 2a of said base plate 2 of ferromagnetic material, the second wing 8c of each fastening bracket 8 being fixed to the end portion 7a of said non- ferromagnetic support means 7, that is to say to one of the two portions of the non-ferromagnetic support means 7 which exceed the short sides 2a of the base plate 2 of ferromagnetic material.
Preferably, the aforementioned second wing 8c of each fastening bracket 8 defines a flat portion coupled with a corresponding and matching end portion 7a of said non- ferromagnetic support means 7.
Preferably, each fastening bracket 8 comprises a flat central core 8a from the ends of which the aforementioned end wings 8b, 8c project at a right angle with respect to the central core 8a with inclinations that are opposite one another .
Preferably, the aforementioned non-ferromagnetic support means 7 define a support frame, which:
- is supported at the aforementioned end portions 7a by the portions 8c of the fastening brackets 8 so as to substantially be parallel to the base plate 2 of ferromagnetic material;
- delimits a central opening in correspondence of which the vibrating diaphragm 6 is positioned;
is fixed to the vibrating diaphragm 6 in correspondence of two separate side portions, so as to allow the vibrating diaphragm 6 to be able to vibrate.
Preferably, the vibrating diaphragm 6 and the aforementioned support frame 7 are fixed to one another in correspondence of two opposite median portions defined with reference to the first direction X-X, the opposite portions of the vibrating diaphragm 6 that are distal with respect to said median portions overhanging said median portions.
Preferably, the vibrating diaphragm 6 substantially has a straight cross shape, in which from a rectangular core 6a arranged with the long sides 2b parallel with respect to said first direction X-X project two due opposite side portions 6b for fixing to the aforementioned support frame.
Preferably, the central opening defined by said support frame extends in said first direction X-X so as to exceed the aforementioned distal portions of the vibrating diaphragm 6.
Preferably, the bulk in plan of the vibrating diaphragm 6 is circumscribed in the bulk in plan of the base plate 2 of ferromagnetic material.
With specific reference to the use of the electromagnetic transducer 1, this is intended to be fixed and housed in a special housing seat 13 of an object 12.
In accordance with the preferred embodiments illustrated in figures from 7 to 14, the aforementioned object 12 is made up, as a non-limiting example, of a temple of an eyeglass frame. The aforementioned eyeglass frame comprises a frame front 18, provided with nose pads 20, from which two respective and opposite temples 12 project.
In the thickness of at least one of the two temples 12, in the example in both the temples 12, it is foreseen for there to be a housing 13 in which the aforementioned electromagnetic transducer 1 is contained.
Preferably the magnetic yoke of the electromagnetic transducer 1 is supported and kept in position inside the aforementioned housing seat 13 of the temple 12 by means of a resilient material element 9, in such a way that the electromagnetic transducer 1 is supported with elastic suspension by said resilient material element 9.
In accordance with the embodiment illustrated in figures 9 to 11, the transducer according to the invention comprises a plate 10 for transmitting vibrations which is integrally and rigidly coupled with the vibrating diaphragm 6 through engaging means 11, which specifically comprise fixing screws 11 which engage corresponding holes foreseen both on the vibrating diaphragm 6 and in the aforementioned plate 10. As an alternative to what is described, it is clear that other fixing means can be foreseen as an alternative to the use of the aforementioned fixing screws 11 that are a preferred embodiment.
As illustrated in figures from 9 to 11, the vibrating diaphragm 6 and the plate 10 are integrally and rigidly coupled to one another by the aforementioned fixing screws 11 with the interposition, between them, of the portion of the aforementioned resilient material element 9 that secures said support with elastic suspension of the electromagnetic transducer to the aforementioned resilient material element 9.
Again with reference to the embodiment illustrated in figures 9 to 11, the resilient material element 9 is highlighted comprising a perimetral edge 9a that delimits a substantially flat wall 9b, said substantially flat wall 9b being the aforementioned portion of the resilient material element 9 which is interposed between the vibrating diaphragm 6 and the plate 10 so as to secure the aforementioned support with the elastic suspension of the electromagnetic transducer 1 with respect to the temple 12.
The aforementioned perimetral edge 9a of the resilient material element 9 is engagingly shape coupled between matching profiles with a corresponding perimetral edge 14 that delimits the opening for accessing the housing seat 13 thus ensuring that the resilient material element 9 is fixed to the temple 12 and therefore the support with elastic suspension of the electromagnetic transducer 1 inside the housing seat 13, avoiding any direct contact (this without the interposition of a resilient material that is capable of softening the vibration) between the magnetic yoke of the electromagnetic transducer 1 and the walls of the temple 12 of the eyeglass frame.
With reference to the embodiment illustrated in figures 12 to 14, the resilient material element 9 defines a hollow containment body inside which the electromagnetic transducer 1 is inserted and kept. The resilient material element 9 comprises a perimetral edge 9a that delimits a substantially flat front wall 9b, to which the plate 10 is directly applied for transmitting vibrations coming from the vibrating diaphragm 6 of the electromagnetic transducer 1. Specifically, the plate 10 can be glued to the wall 9b of the resilient material element 9 or, more preferably, the aforementioned wall 9b can comprise a through opening that is delimited by a perimetral edge with which the perimetral edge of the plate 10 is engaged, with shape coupling between matching profiles.
Concerning now the fixing of the resilient material element 9 to the temple 12, this is obtained through a shape coupling between matching profiles of the aforementioned perimetral edge 9a of the resilient material element 9 with a corresponding perimetral edge 14 that defines the opening for accessing the housing seat 13. Such a fixing modality thus makes it possible to obtain the fixing of the resilient material element 9 to the temple 12 with elastic suspension of the electromagnetic transducer 1 inside the housing seat 13, avoiding any direct contact (i.e. without the interposition of a resilient material that is capable of softening the vibration) between the magnetic yoke of the electromagnetic transducer 1 and the temple 12 of the eyeglass frame.
Advantageously, this makes it possible to avoid, or at least strongly reduce, that the vibrations of the electromagnetic transducer 1 propagate also to the object 12. In the case in which the aforementioned object 12 comprises a microphone that is associated with its structure, and the user of the object 12 is having an audio conversation, for example a telephone conversation, with an interlocutor, the absence of vibrations transmitted by the electromagnetic transducer to the object 12 itself makes it possible to prevent such vibrations from being picked up by the aforementioned microphone that is mounted at the edge of the object 12 itself generating an annoying echo return that is perceived by the aforementioned interlocutor.
In both the embodiments illustrated and described above, there is moreover a lid 15 which is associated with the side of the respective plate 10 that is opposite the side of such a plate 10 facing the vibrating diaphragm 6 of the electromagnetic transducer 1. Such a lid 15 carries out the double function of hiding the plate 10 (and the fixing means 11 in the case of the embodiment of figures 9 to 11) as well as of ensuring the transmission of the vibrations from the vibrating diaphragm 6 of the electromagnetic transducer 1 to the portion of the body of the user which is in contact with such a lid 15, in the example a user wearing the eye glass comprising the temples 12 in the housing seats 13 of which the electromagnetic transducers 1 are housed.
With reference to the aforementioned eyeglass frame, it is worth highlighting how it is preferably also provided with a microphone 16 for picking up the sounds and the words emitted by the user wearing the eyeglass frame itself and sending them to a suitable voice transmission system. In this hypothesis, the aforementioned microphone 16 is preferably housed, in a position that is protected, inside a cavity of the frame front 18. In order to allow words and/or sounds to reach the microphone 16 from outside the aforementioned cavity, the frame front 18 is provided with at least one through hole 19 (in the example of figures 7b and 7c there are two through holes 19) for connecting the inside of the aforementioned cavity present inside the frame front 18 with the outside of the frame front.
In accordance with one preferred embodiment, the aforementioned microphone 16 is housed in a cavity obtained in correspondence of the central portion of the frame front 18, more specifically in the portion comprised between the two nose pads 20, preferably above such nose pads.
As can be seen in figure 7b, by removing a lid 21 it is possible to access the microphone 16 for possible maintenance operations.
Differently, it is possible to provide a frame for eyeglass in which the aforementioned microphone is positioned in correspondence of one of the two side portions of the frame front, that is to say near to a portion where the frame front 18 is connected, in an articulated manner, to a respective temple. With reference to the frame front 18 of the eyeglass frame, it is worth highlighting how in it an inner side (cf. fig. 7b) facing towards the face of the user, wearing the eyeglass frame and an opposite outer side (cf. fig. 7a) can be defined. With this said, it is worth highlighting how the aforementioned hole 19, through which the sounds and/or the voices reach from outside to the microphone 16, it is advantageously positioned in correspondence of the aforementioned inner side of the frame front .
This makes it possible for the microphone 16 to pick up the sounds and/or the words emitted from the mouth of the user wearing the eyeglass frame in a correct and efficient manner, without being disturbed by elements such as wind that hits the eyeglass frame.
In accordance with what can be understood in figures 7a, 7b and 7c, each through hole 19 extends from the aforementioned inner cavity of the frame front 18 so as to emerge outside the frame front 18 in correspondence of a point of such a frame front 18 positioned in the groove, or against it, in which the lenses (not illustrated) are inserted and held. More in detail, the through hole 19 emerges out from the frame front 18 at a point that is further back than the respective lens with respect to the outer side of the frame front. After the tests carried out, such a positioning of the through holes 19 was found to be preferred since the lens makes it possible to obtain an effective wind barrier, preventing the microphone from detecting crackles and the like, despite being very close to the mouth of the user wearing the eyeglass frame.
Also in the case in which the cavity intended for housing the microphone is positioned in correspondence of one of the two side portions of the frame front, in accordance with the different embodiment previously described, it is advantageous for the through hole in communication with the aforementioned cavity to emerge near to or inside the groove in which the lenses are inserted, in a position that is further back than the lens with respect to the outer side of the frame front.
As can be appreciated from what has been described, the electromagnetic transducer for generating vibrations for sounds and/or words bone conduction according to the present invention makes it possible to satisfy the aforementioned requirement and to overcome at the same time the drawbacks referred to in the introductory part of the present description with reference to the prior art.
In particular, as was found through testing, the structure of the electromagnetic transducer for generating vibrations for sounds and/or words bone conduction despite having small dimensions and bulk, makes it possible to ensure an excellent transduction of the sounds and/or words perceived by the user. This depends upon the fact that the structure of the electromagnetic transducer with the ends of the aforementioned non-ferromagnetic support means that exceed both the aforementioned short sides of the base plate, as well as the simultaneous connection of the wings of the fastening brackets to such projecting ends, make it possible to leave high freedom to the vibrating diaphragm to be able to vibrate due to the variations of the magnetic field induced by the voice coil, despite the very small dimensions of such components.
Furthermore, the aforementioned characteristic of the electromagnetic transducer of being supported with elastic suspension makes it possible to avoid, or in any case to reduce, that the vibrations generated by the electromechanical transducer are directly transmitted, i.e. interposition of one layer of resilient and softening material, to the object in which said transducer is housed.
Yet a further advantage coming from using the electromagnetic transducer for generating vibrations for sounds and/or words bone conduction according to the invention comes from the simplicity of its structure which ensures a good operation over time and allows it to be produced in automated production lines. Of course, a man skilled in the art, with the purpose of satisfying contingent and specific requirements, can carry out numerous modifications and variants to the electromagnetic transducer for generating vibrations for sounds and/or words bone conduction described above, all moreover covered by the scope of protection of the invention as defined in the following claims.

Claims

1. An electromagnetic transducer for generating vibrations for sounds and/or words bone conduction, including a magnetic yoke comprising:
- a ferromagnetic material base plate (2) elongated in a first direction (X-X) , in said ferromagnetic material base plate (2) being detectable two long sides (2b) and two short sides (2a) extending parallel and perpendicular to said first direction (X-X) , respectively;
- a magnetic pole (3) projecting axially from a central area of said ferromagnetic material base plate (2), said magnetic pole (3) having an elongated shape in said first direction (X-X) perpendicular to the said magnetic pole axis (3) ;
- a voice coil (4) positioned around said magnetic pole (3), said voice coil (4) having an elongated shape in said first direction (X-X) in agreement with the elongated shape of said magnetic pole (3) ;
- a pair of permanent magnets (5) positioned outside said voice coil (4), each permanent magnet (5) of said pair of permanent magnets being positioned close and along a respective short side (2a) of said ferromagnetic material base plate (2) so that said voice coil (4) results positioned between said pair of permanent magnets (5) along said first direction (X-X) ;
- a ferromagnetic material vibrating diaphragm (6); - fixing means for supporting and spacing said vibrating diaphragm (6) from said ferromagnetic material base plate (2), so that said vibrating diaphragm (6) is parallel to and facing to said -ferromagnetic material base plate (2), with said voice coil (4) and said permanent magnets (5) included between said ferromagnetic material base plate (2) and said vibrating diaphragm (6),
wherein :
said fixing means comprise non-ferromagnetic supporting means (7) to interrupt the magnetic direct continuity of said vibrating diaphragm (6) with said ferromagnetic material base plate (2), and
- said vibrating diaphragm (6) being spaced by an air gap from said magnetic pole (3), from said voice coil (4) and from said pair of magnets,
characterized in that:
- said non-ferromagnetic support means (7) extend along said first direction (X-X) in order to exceed both aforementioned short sides (2a) of said ferromagnetic material base plate (2) with respective end sections (7a), and
for each short side (2a) of said ferromagnetic material base plate (2) said fixing means include a respective fastening bracket (8) that connects a respective short side (2a) of the ferromagnetic material base plate (2) with the respective end portion (7a) exceeding said short side (2a) , thereby ensuring the support of said vibrating diaphragm (6) to said ferromagnetic material base plate (2) in said parallel position, facing and spaced from said ferromagnetic material base plate (2) .
2. An electromagnetic transducer according to claim 1, wherein :
- each fastening bracket (8) comprises a central core (8a) extending between opposite longitudinal ends from each of them projects a respective wing end inclined relative to the straight line connecting said opposite ends of the central core (8a);
- the wings ends of each fastening bracket (8) are inclined in the opposite manner between them compared to the straight line connecting said opposite ends of the central core ( 8a) , and
- a first wing (8b) of each fastening bracket (8) being fixed to a short side (2a) of said ferromagnetic material base plate (2), the second wing (8c) of each fastening bracket (8) being fixed to the end portion (7a) of said non- ferromagnetic support means (7), that exceeds said short side (2a) of said ferromagnetic material base plate (2) .
3. An electromagnetic transducer according to claim 2, wherein the second wing (8c) of each fastening bracket (8) locates a flat portion coupled to a corresponding and complementary end portion (7a) of said non-ferromagnetic support means (7).
4. An electromagnetic transducer according to claim 2 or 3, wherein each fastening bracket (8) comprises a central flat core (8a) from thereof ends overhang aforesaid end wings (8b, 8c) which are flat and are substantially inclined at right angle with respect to the central core (8a) .
5. An electromagnetic transducer according to any one of claims 1 to 4, wherein said non-ferromagnetic support means (7) identify a supporting frame which:
- is supported by said mounting brackets (8) in parallel to said ferromagnetic material base plate (2);
- delimits a central opening in correspondence of which is positioned said vibrating diaphragm (6);
is fixed to said vibrating diaphragm (6) in correspondence of two distinct lateral portions leaving to said vibrating diaphragm (6) the opportunity to vibrate.
6. An electromagnetic transducer according to claim 5, wherein said vibrating diaphragm (6) and said supporting frame are fixed to each other in correspondence of two opposite median portions located with reference to said first direction (X-X) , the opposed portions of the vibrating diaphragm (6) distal from said median portions resulting to be in overhang from said median portions.
7. An electromagnetic transducer according to claim 6, wherein said vibrating diaphragm (6) presents a substantially straight cross shape, wherein from a rectangular core (6a), arranged with the long sides (2b) in parallel to said first direction (X-X) , overhang two opposite median side portions (6b) for fixing to said supporting frame.
8 . An electromagnetic transducer according to claim 6 or 7 , wherein the central opening located by said supporting frame extends in said first direction (X-X) in order to overhang said distal portions of the vibrating diaphragm (6).
9. An electromagnetic transducer according to any one of claims 1 to 8, wherein the plan dimensions of said vibrating diaphragm (6) is limited in plan dimensions of said ferromagnetic material base plate (2)..
10. An electromagnetic transducer according to any one of claims 1 to 9, wherein said magnetic yoke is supported and maintained in position by a resilient material element (9) with respect to an object to which said transducer is fixed, so as to result supported with elastic suspension from said resilient material element (9).
11. An electromagnetic transducer according to claim 10, wherein said resilient material element (9) defines a hollow containment body inside which said electromagnetic transducer (1) is housed and is kept there.
12. An electromagnetic transducer according to claim 10 or 11, wherein:
- said element (9) of resilient material comprises a plate (10) for transmitting vibrations received from said vibrating diaphragm (6) and
- said element (9) of resilient material comprises a front through opening delimited by a perimetral edge with which a perimetral edge of the plate (10) engages through shape coupling between matching profiles, so that said plate
(10) is integrally coupled with said vibrating diaphragm (6) so as to be set in vibration by it.
13. An electromagnetic transducer according to claim 10, comprising a plate (10) for transmission of vibrations, said plate (10) being integrally and rigidly coupled to said vibrating diaphragm (6) by engaging means (11), wherein said vibrating diaphragm (6) and said plate (10) are rigidly coupled to each other integrally from said engagement means
(11) , with interposition among them of a portion of said resilient material element (9), which ensures said support with elastic suspension of said magnetic yoke to said element
(9) of resilient material.
14. Object comprising a housing in which an electromagnetic transducer is received for generating vibrations for sounds and/or words bone conduction, wherein said electromagnetic transducer is an electromagnetic transducer according to any one of claims 1 to 9, wherein the support of said electromagnetic transducer in said housing is ensured by a resilient material element (9) according to any one of claims 10 to 13, so as to soften the propagation of vibrations from said magnetic yoke toward said object, therefore being avoided a direct contact between said magnetic yoke and said housing.
15. An eyeglass frame comprising a frame front (18), provided with nose pads (20), and with opposite temples (12) projecting out from said frame front (18), wherein:
- said frame front (18) comprises an inner side facing the face of the user wearing the frame for eyeglass and an opposite outer side,
inside the thickness of at least one of the two temples (12), preferably inside both temples (12), a housing (13) is foreseen in which an electromagnetic transducer is housed for generating vibrations for sounds and/or words bone conduction,
- said electromagnetic transducer is an electromagnetic transducer (1) according to any one of claims 1 to 9,
- the support of said electromagnetic transducer (1) in said housing (13) is ensured by means of a resilient material element (9) according to any one of claims 10 to 13, so as to soften the propagation of vibration from said magnetic yoke towards said object, thus avoiding direct contact between said magnetic yoke and said housing.
16. An eyeglass frame according to claim 15, comprising a microphone (16) for picking up sounds and/or words emitted by the user wearing the eyeglass frame, wherein:
said microphone (16) is housed in a position protected inside a cavity made in the frame front (18) and
- said frame front (18) comprises a through hole (19) to place the cavity, in which said microphone (16) is housed, in communication with the external environment ot said frame front (18).
17. An eyeglass frame according to claim 16, wherein said hole (19) extends from said inner cavity to a portion positioned at said inner side of the frame front (18).
18. An eyeglass frame according to claim 17, wherein said through hole (19) extends from said inner cavity up to a portion positioned near to a groove of the frame front (18) intended for housing and holding a lens.
19. An eyeglass frame according to claims 16, 17 or 18, wherein said microphone (16) is housed inside a cavity made in correspondence of a central portion of said frame front (18) comprised between said nose pads (20).
20. An eyeglass frame according to claim 16, 17 or 18, wherein said microphone (16) is housed inside a cavity positioned in correspondence of one of the two side portions of the frame front where said frame front is connected in an articulated manner to a respective temple.
PCT/IB2014/065695 2013-10-29 2014-10-29 Electromagnetic transducer for generating vibrations for sound and/or words bone conduction WO2015063705A1 (en)

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US15/032,476 US20160261956A1 (en) 2013-10-29 2014-10-29 Electromagnetic transducer for generating vibrations for sound and/or words bone conduction
CN201480070221.4A CN105850153B (en) 2013-10-29 2014-10-29 It is used to form the electromagnetic transducer of sound and/or the vibration of voice osteoacusis
EP14812606.3A EP3063953A1 (en) 2013-10-29 2014-10-29 Electromagnetic transducer for generating vibrations for sound and/or words bone conduction

Applications Claiming Priority (2)

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IT001797A ITMI20131797A1 (en) 2013-10-29 2013-10-29 ELECTROMAGNETIC TRANSDUCER TO GENERATE VIBRATIONS FOR BONE CONDUCTION OF SOUNDS AND / OR WORDS
ITMI2013A001797 2013-10-29

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ITMI20131797A1 (en) 2015-04-30
CN105850153A (en) 2016-08-10
CN105850153B (en) 2019-09-10
US20160261956A1 (en) 2016-09-08

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